diff -Naurp gcc/config/avr/avr-devices.c gcc/config/avr/avr-devices.c
--- gcc/config/avr/avr-devices.c 2012-02-10 20:28:58.000000000 +0530
+++ gcc/config/avr/avr-devices.c 2012-02-10 20:29:40.000000000 +0530
-@@ -289,6 +289,7 @@ const struct mcu_type_s avr_mcu_types[]
+@@ -288,6 +288,7 @@ const struct mcu_type_s avr_mcu_types[]
{ "atxmega64a4u", ARCH_AVRXMEGA4, "__AVR_ATxmega64A4U__", 0, 0x2000, "x64a4u"},
{ "atxmega64b1", ARCH_AVRXMEGA4, "__AVR_ATxmega64B1__", 0, 0x2000, "x64b1" },
{ "atxmega64b3", ARCH_AVRXMEGA4, "__AVR_ATxmega64B3__", 0, 0x2000, "x64b3"},
diff -Naurp gcc/config/avr/t-avr gcc/config/avr/t-avr
--- gcc/config/avr/t-avr 2012-02-10 20:28:58.000000000 +0530
+++ gcc/config/avr/t-avr 2012-02-10 20:29:40.000000000 +0530
-@@ -299,6 +299,7 @@ MULTILIB_MATCHES = \
+@@ -298,6 +298,7 @@ MULTILIB_MATCHES = \
mmcu?avrxmega4=mmcu?atxmega64a4u \
mmcu?avrxmega4=mmcu?atxmega64b1 \
mmcu?avrxmega4=mmcu?atxmega64b3 \